CodePen Embed - css-em

<div class="box">
  <span class="title1">title 1</span>
  <span class="title2">title 2</span>
</div>

// ue的宽度
$ue-width: 640

@function px2rem($px) 
  @return #{$px/$ue-width*100}rem


div 
  border: 1px solid #ccc
  width: px2rem(100)

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